Andres Freund <and...@2ndquadrant.com> writes: > On 2015-01-26 21:13:31 -0500, Robert Haas wrote: >> So maybe we should also do something like what LWLocks do, and make a >> union between the actual structure and an appropriate array of padding >> bytes - say either 64 or 128 of them.
> Hm. That's a bit bigger patch. I'm inclined to just let it slide for the > moment. I still have plans to downsize some of sbufdesc's content (move > the io lock out) and move the content lwlock inline. Then we're not > going to have much choice but do this... Even if you didn't have plans like that, it would be entire folly to imagine that buffer headers will be exactly 64 bytes without some forcing function for that. Accordingly, I vote against applying any patch that pretends to improve their alignment unless it also does something to ensure that the size is a power of 2. Any notational changes that are forced by that would be much better done in a patch that does only that than in a patch that also makes functional changes to the header contents. regards, tom lane -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers